| 摘要 |
PURPOSE:To obtain the titled fiber having improved tenacity and modulus, by spinning a specific acrylonitrile polymer dope, coagulating in a coagulation bath and subjecting the undrawn yarn to the primary drawing and the secondary drawing at specific draw ratios. CONSTITUTION:A dope of an acrylonitrile polymer composed mainly of acryloni trile and having an intrinsic viscosity of 2.5-3.6, preferably 2.8-3.5, a polymer concentration of 5-20wt%, and solution viscosity of 1,500-10,000 poise at 45 deg.C is extruded through a spinneret into air or an inert gas atmosphere. The spun yarn is introduced into a coagulation bath, and the coagulated fiber yarn is drawn at a draw ratio of 2-10 after or simultaneous to washing with water. The yarn is dried, densified, and then drawn at 180-240 deg.C under dry-hot condi tion at a draw ratio of 1.2-5 to obtain the objective fiber yarn.
|
